using Org.BouncyCastle.Asn1.Pkcs;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Pkcs;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;
using System;
using System.Xml;

namespace Daemon.Common.WxPay
{
	public abstract class RSAKeyConvert
	{
		/// <summary>    
		/// RSA私钥格式转换，java->.net    
		/// </summary>    
		/// <param name="privateKey">java生成的RSA私钥</param>    
		/// <returns></returns>   
		public static string RSAPrivateKeyJava2DotNet(string privateKey)
		{
			var privateKeyParam = (RsaPrivateCrtKeyParameters)PrivateKeyFactory.CreateKey(Convert.FromBase64String(privateKey));
			return
				string.Format(
					"<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent><P>{2}</P><Q>{3}</Q><DP>{4}</DP><DQ>{5}</DQ><InverseQ>{6}</InverseQ><D>{7}</D></RSAKeyValue>",
					Convert.ToBase64String(privateKeyParam.Modulus.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.PublicExponent.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.P.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.Q.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.DP.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.DQ.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.QInv.ToByteArrayUnsigned()),
					Convert.ToBase64String(privateKeyParam.Exponent.ToByteArrayUnsigned()));
		}
		/// <summary>    
		/// RSA私钥格式转换，.net->java    
		/// </summary>    
		/// <param name="privateKey">.net生成的私钥</param>    
		/// <returns></returns>   
		public static string RSAPrivateKeyDotNet2Java(string privateKey)
		{
			XmlDocument doc = new XmlDocument();
			doc.LoadXml(privateKey);
			BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
			BigInteger exp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
			BigInteger d = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("D")[0].InnerText));
			BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("P")[0].InnerText));
			BigInteger q = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Q")[0].InnerText));
			BigInteger dp = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DP")[0].InnerText));
			BigInteger dq = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("DQ")[0].InnerText));
			BigInteger qinv = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("InverseQ")[0].InnerText));
			RsaPrivateCrtKeyParameters privateKeyParam = new RsaPrivateCrtKeyParameters(m, exp, d, p, q, dp, dq, qinv);
			PrivateKeyInfo privateKeyInfo = PrivateKeyInfoFactory.CreatePrivateKeyInfo(privateKeyParam);
			byte[] serializedPrivateBytes = privateKeyInfo.ToAsn1Object().GetEncoded();
			return Convert.ToBase64String(serializedPrivateBytes);
		}

		/// <summary>    
		/// RSA公钥格式转换，java->.net    
		/// </summary>    
		/// <param name="publicKey">java生成的公钥</param>    
		/// <returns></returns>    
		public static string RSAPublicKeyJava2DotNet(string publicKey)
		{
			RsaKeyParameters publicKeyParam = (RsaKeyParameters)PublicKeyFactory.CreateKey(Convert.FromBase64String(publicKey));
			return string.Format("<RSAKeyValue><Modulus>{0}</Modulus><Exponent>{1}</Exponent></RSAKeyValue>",
				Convert.ToBase64String(publicKeyParam.Modulus.ToByteArrayUnsigned()),
				Convert.ToBase64String(publicKeyParam.Exponent.ToByteArrayUnsigned()));
		}
		/// <summary>    
		/// RSA公钥格式转换，.net->java    
		/// </summary>    
		/// <param name="publicKey">.net生成的公钥</param>    
		/// <returns></returns>   
		public static string RSAPublicKeyDotNet2Java(string publicKey)
		{
			XmlDocument doc = new XmlDocument(); doc.LoadXml(publicKey);
			BigInteger m = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Modulus")[0].InnerText));
			BigInteger p = new BigInteger(1, Convert.FromBase64String(doc.DocumentElement.GetElementsByTagName("Exponent")[0].InnerText));
			RsaKeyParameters pub = new RsaKeyParameters(false, m, p);
			SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pub);
			byte[] serializedPublicBytes = publicKeyInfo.ToAsn1Object().GetDerEncoded();
			return Convert.ToBase64String(serializedPublicBytes);
		}

	}
}